ALUMINE IN METEORIC STONES. 



191 



thirtieth in the meteoric stone. At the bottom of the retort 

 was left a grayish mass, which, after having been diluted iu 

 three parts of water, produced a sensible heat. 



This solution, when filtered, was of a fine green colour, Solution filter. 

 owing to the nickel and iron. When evaporated, it pro- ed and evapo- 

 disced by refrigeration tetraedral prismatic crystals of a light 

 green. 



The crystallization being confused, I dissolved the salt, Sulphates of 



and obtained crystals of two distinct forms. Those of vi- nia § lle ^ ™& 

 ■ . . . ■ -ii alllln me crys- 



tnol of magnesia were m tetraedral prisms, intermingled talhzed- 



with crystals of alum, exhibiting octaedra bisected diagon- 

 ally. Both these salts had a green tinge. 



The small quantity of alum produced by this first vitrio- Residuum 

 ligation showed me, that only a part of the alumine was acted ^ eated ai " resh 

 on. 1 therefore distilled the dried residuum, which was di- acid. 

 minished five nominal cwt. with eighteen nominal cwt. of vi- 

 triolic acid. The residuum, after being lixiviated, afforded 

 me a solution less tinged with green ; which, being evapo- 

 rated, yielded me more alum than the former. The resi- 

 duum of this lixiviation being dried and weighed, I found 

 there were two nominal cwt. of alumine and magnesia vi- More alumine 

 triolized in this operation. 81ld ™ a S™*™- 



In order to disengage the last portions of alumine and Treated a 



magnesia, that remained still interposed among the silex, or thl , rd tln *ewjth 

 i • , t i- mi i , •-. i- i • sulphuric acid, 



pulverized quartz, I distilled the residuum a third time 



with twelve nominal cwt. of concentrated vitriolic acid. 



After what remained in the retort had been lixiviated, fil- -\j &Te a j um j ne 

 tered, and dried, I found that the sulphuric acid had vitriol- and magnesia. 

 ized two more nominal cwt. of alumine and magnesia. By 

 distilling the residuum a fourth time with vitriolic acid, I 

 satisfied myself, that it contained no more alumine or mag- 

 nesia. Nothing remained in the retort but very white silex, 

 weighing nine nominal cwt. 



When I analysed the meteoric stone of Aigle, I added to- Meteoric stone 

 gether the solutions of the three vitriolizations, which, on of Aigle. 

 being evaporated, produced me at first alum, and afterward 

 vitriol of magnesia. But in the analysis of the aerolite of 

 Salles, I evaporated the solutions of the three vitriolizations 

 separately : and hence I learned, that the sulphuric acid 

 vitriolized the magnesia first : since the first lixivium yielded 



but 



